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CameraExts.kt
/* * Copyright (C) 2017 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.system.runtimepermissions.extensions import android.hardware.Camera import android.view.Surface /** * Calculate the correct orientation for a [Camera] preview that is displayed on screen. * * * Implementation is based on the sample code provided in * [Camera.setDisplayOrientation]. */ fun Camera.CameraInfo.calculatePreviewOrientation(rotation: Int): Int { val degrees = when (rotation) { Surface.ROTATION_0 -> 0 Surface.ROTATION_90 -> 90 Surface.ROTATION_180 -> 180 Surface.ROTATION_270 -> 270 else -> 0 } return when (facing) { Camera.CameraInfo.CAMERA_FACING_FRONT -> (360 - ((orientation + degrees) % 360)) % 360 Camera.CameraInfo.CAMERA_FACING_BACK -> (orientation - degrees + 360) % 360 else -> orientation } }